5491991 has 16 divisors (see below), whose sum is σ = 6048000. Its totient is φ = 4972800.

The previous prime is 5491979. The next prime is 5491999. The reversal of 5491991 is 1991945.

It is a cyclic number.

It is not a de Polignac number, because 5491991 - 2¹⁰ = 5490967 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5491999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36785 + ... + 36933.

It is an arithmetic number, because the mean of its divisors is an integer number (378000).

Almost surely, 2^5491991 is an apocalyptic number.

5491991 is a deficient number, since it is larger than the sum of its proper divisors (556009).

5491991 is a wasteful number, since it uses less digits than its factorization.

5491991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 250.

The product of its digits is 14580, while the sum is 38.

The square root of 5491991 is about 2343.4997333049. The cubic root of 5491991 is about 176.4316946595.

The spelling of 5491991 in words is "five million, four hundred ninety-one thousand, nine hundred ninety-one".